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The worst environmental hazards were cre...

The worst environmental hazards were created by accidents in nuclear power plant and MIC gas tragedy respectively

A

Russia in 1990 & bhopal 1986

B

Ukraine in 1988 & USA in 1984

C

Bhopal in 1984&Russia in 1990

D

Ukraine I 1986 and bhopal in 1984

Text Solution

Verified by Experts

The correct Answer is:
D
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A transformer is a device which increases or decreases alternating voltage through mutual induction. It consists of two coils wound on the same code. One of the coil is connected to input alternating supply. This is called primary coil. The other coil gives the output. i.e. it is connected to external load. This coil is called secondary coil. The alternating emf applied across the primary current causes an alternating current to flow through it. This alternating current creates a continuously changing magnetic flux through the core. The changing magnetic flux is linked with secondary coil. If there is no leakage of flux, then the flux linked per unit turn with primary coil is equal to the flux linked per unit turn with secondary coil. Let phi_(S) is flux linked in secondary coil and phi_(P) is flux linked in primary coil then (phi_(S))/(N_(S))=(phi_(P))/(N_(P)) (where N_(S) and N_(P) are respective number of turns in secondary and primary of transformer) :. (1)/(N_(s))(d phi_(S))/(dt)=(1)/(N_(P))xx(d phi_(P))/(dt) or (1)/(N_(S)) E_(S)=(1)/(N_(P))E_(P) ( :' E = - (d phi)/(dt) = emf in a coil ) If we assume that there is no loss of power in a transformer, and the currents in the primary and secondary coils are respectively i_(P) and i_(S) , then